1ST MARCH 2011. 2. New Codes. 4 new codes have been introduced to the April 2011 Delay Attribution Guide (DAG). 1ST MARCH 2011. 3. XO Delay Code reasoning. The new XO delay code has been introduced to reduce the use of XZ (generic external) for certain events such as:-Trees falling from outside railway boundaries Masonry / buildings (non railway) falling or threatening to fall onto the infrastructure Motor Vehicles landing on infrastructure Air borne
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